add m4a conversion script

2025-11-04 04:50:42 +01:00 · 2017-11-03 11:33:21 +08:00
parent de01589b94
commit 176c30c42c
1 changed files with 108 additions and 0 deletions
--- a/108
+++ b/108
@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+
+set -o errexit -o noclobber -o nounset -o pipefail
+
+codec=copy
+extension=m4a
+mode=chaptered
+GREP=$(grep --version | grep -q GNU && echo "grep" || echo "ggrep")
+
+if ! [[ $(type -P "$GREP") ]]; then
+    echo "$GREP (GNU grep) is not in your PATH"
+    echo "Without it, this script will break."
+    echo "On macOS, you may want to try: brew install grep"
+    exit 1
+fi
+
+if [ "$#" -eq 0 ]; then
+        echo "Usage: bash AAXtoM4A [--single] AUTHCODE {FILES}"
+        exit 1
+fi
+
+if [[ "$1" == '--single' ]]
+then
+    mode=single
+    shift
+fi
+
+if [ ! -f .authcode ]; then
+    auth_code=$1
+    shift
+else
+    auth_code=`head -1 .authcode`
+fi
+
+debug() {
+    echo "$(date "+%F %T%z") ${1}"
+}
+
+trap 'rm -r -f "${working_directory}"' EXIT
+working_directory=`mktemp -d 2>/dev/null || mktemp -d -t 'mytmpdir'`
+metadata_file="${working_directory}/metadata.txt"
+
+save_metadata() {
+    local media_file
+    media_file="$1"
+    ffprobe -i "$media_file" 2> "$metadata_file"
+}
+
+get_metadata_value() {
+    local key
+    key="$1"
+    normalize_whitespace "$($GREP --max-count=1 --only-matching "${key} *: .*" "$metadata_file" | cut -d : -f 2- | sed -e 's#/##g;s/ (Unabridged)//' | tr -s '[:blank:]' ' ')"
+}
+
+get_bitrate() {
+    get_metadata_value bitrate | $GREP --only-matching '[0-9]\+'
+}
+
+normalize_whitespace() {
+    echo $*
+}
+
+for path
+do
+    debug "Decoding ${path} with auth code ${auth_code}..."
+
+    save_metadata "${path}"
+    genre=$(get_metadata_value genre)
+    artist=$(get_metadata_value artist)
+    title=$(get_metadata_value title)
+    output_directory="$(dirname "${path}")/${genre}/${artist}/${title}"
+    mkdir -p "${output_directory}"
+    full_file_path="${output_directory}/${title}.${extension}"
+
+    </dev/null ffmpeg -loglevel error -stats -activation_bytes "${auth_code}" -i "${path}" -vn -codec:a "${codec}" -ab "$(get_bitrate)k" -map_metadata -1 -metadata title="${title}" -metadata artist="${artist}" -metadata album_artist="$(get_metadata_value album_artist)" -metadata album="$(get_metadata_value album)" -metadata date="$(get_metadata_value date)" -metadata track="1/1" -metadata genre="${genre}" -metadata copyright="$(get_metadata_value copyright)" "${full_file_path}"
+
+    debug "Created ${full_file_path}."
+
+    cover_path="${output_directory}/cover.jpg"
+    debug "Extracting cover into ${cover_path}..."
+    </dev/null ffmpeg -loglevel error -activation_bytes "${auth_code}" -i "${path}" -an -codec:v copy "${cover_path}"
+
+    if [ "${mode}" == "chaptered" ]; then
+        chaptercount=$($GREP -Pc "Chapter.*start.*end" $metadata_file)
+        debug "Extracting ${chaptercount} chapter files from ${full_file_path}..."
+
+        chapternum=1
+        while read -r -u9 first _ _ start _ end
+        do
+            if [[ "${first}" = "Chapter" ]]
+            then
+                read -r -u9 _
+                read -r -u9 _ _ chapter
+                chapter_title="${title} - $(printf %0${#chaptercount}d $chapternum) ${chapter}"
+                chapter_file="${output_directory}/${chapter_title}.${extension}"
+                </dev/null ffmpeg -loglevel error -stats -i "${full_file_path}" -i "${cover_path}" -ss "${start%?}" -to "${end}" -vn -codec:a copy -map 0:0 -map 1:0 -id3v2_version 3 \
+                    -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" -metadata track="${chapternum}" -metadata title="${chapter_title}" \
+                    "${chapter_file}"
+                chapternum=$((chapternum + 1 ))
+            fi
+        done 9< "$metadata_file"
+        rm "${full_file_path}"
+        debug "Done creating chapters. Chaptered files contained in ${output_directory}."
+    fi
+
+    debug "Done."
+    rm "${metadata_file}"
+done